Fig. 1

Experimental design. In the host-effect hypothesis experiment (a) Atlantic (AT), Coho (CO), and Sockeye (SK) Salmon were infected with L. salmonis sourced during commercial Atlantic Salmon harvest. A sub-set of unattached lice served as the starved (STV) control. At 24 and 48 h lice (n = 10) were removed from every species and processed for down-stream microarray and RT-qPCR analysis. In the acclimation hypothesis experiment (b) L. salmonis were sourced from Atlantic Salmon (AT) during harvest as well as from Sockeye Salmon (SK) from a test fishery. Lice from each species (AT, SK) were used to infect both Atlantic and Sockeye Salmon. At 24 and 48 h, lice (n = 8) were removed and processed for downstream RT-qPCR analysis